Blame view
net/tipc/subscr.c
11.3 KB
b97bf3fd8 [TIPC] Initial merge |
1 |
/* |
5b06c85c3 tipc: Cosmetic cl... |
2 |
* net/tipc/subscr.c: TIPC network topology service |
c43072852 [NET] TIPC: Fix w... |
3 |
* |
593a5f22d [TIPC] More updat... |
4 |
* Copyright (c) 2000-2006, Ericsson AB |
13a2e8987 tipc: convert top... |
5 |
* Copyright (c) 2005-2007, 2010-2013, Wind River Systems |
b97bf3fd8 [TIPC] Initial merge |
6 7 |
* All rights reserved. * |
9ea1fd3c1 [TIPC] License he... |
8 |
* Redistribution and use in source and binary forms, with or without |
b97bf3fd8 [TIPC] Initial merge |
9 10 |
* modification, are permitted provided that the following conditions are met: * |
9ea1fd3c1 [TIPC] License he... |
11 12 13 14 15 16 17 18 |
* 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the names of the copyright holders nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. |
b97bf3fd8 [TIPC] Initial merge |
19 |
* |
9ea1fd3c1 [TIPC] License he... |
20 21 22 23 24 25 26 27 28 29 30 31 32 33 |
* Alternatively, this software may be distributed under the terms of the * GNU General Public License ("GPL") version 2 as published by the Free * Software Foundation. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
b97bf3fd8 [TIPC] Initial merge |
34 35 36 37 |
* POSSIBILITY OF SUCH DAMAGE. */ #include "core.h" |
b97bf3fd8 [TIPC] Initial merge |
38 |
#include "name_table.h" |
5b06c85c3 tipc: Cosmetic cl... |
39 |
#include "subscr.h" |
b97bf3fd8 [TIPC] Initial merge |
40 41 |
/** |
11f999060 tipc: rename stru... |
42 |
* struct tipc_subscriber - TIPC network topology subscriber |
00bc00a93 tipc: involve ref... |
43 |
* @kref: reference counter to tipc_subscription object |
13a2e8987 tipc: convert top... |
44 |
* @conid: connection identifier to server connecting to subscriber |
963a18553 tipc: spelling fixes |
45 |
* @lock: control access to subscriber |
57f1d1868 tipc: rename func... |
46 |
* @subscrp_list: list of subscription objects for this subscriber |
b97bf3fd8 [TIPC] Initial merge |
47 |
*/ |
11f999060 tipc: rename stru... |
48 |
struct tipc_subscriber { |
00bc00a93 tipc: involve ref... |
49 |
struct kref kref; |
13a2e8987 tipc: convert top... |
50 51 |
int conid; spinlock_t lock; |
57f1d1868 tipc: rename func... |
52 |
struct list_head subscrp_list; |
b97bf3fd8 [TIPC] Initial merge |
53 |
}; |
00bc00a93 tipc: involve ref... |
54 55 |
static void tipc_subscrp_delete(struct tipc_subscription *sub); static void tipc_subscrb_put(struct tipc_subscriber *subscriber); |
b97bf3fd8 [TIPC] Initial merge |
56 |
/** |
db5a753bf Revert d88dca79d3... |
57 58 59 60 61 62 |
* htohl - convert value to endianness used by destination * @in: value to convert * @swap: non-zero if endianness must be reversed * * Returns converted value */ |
db5a753bf Revert d88dca79d3... |
63 64 65 66 |
static u32 htohl(u32 in, int swap) { return swap ? swab32(in) : in; } |
57f1d1868 tipc: rename func... |
67 68 69 |
static void tipc_subscrp_send_event(struct tipc_subscription *sub, u32 found_lower, u32 found_upper, u32 event, u32 port_ref, u32 node) |
b97bf3fd8 [TIPC] Initial merge |
70 |
{ |
a62fbccec tipc: make subscr... |
71 |
struct tipc_net *tn = net_generic(sub->net, tipc_net_id); |
13a2e8987 tipc: convert top... |
72 73 |
struct tipc_subscriber *subscriber = sub->subscriber; struct kvec msg_sect; |
b97bf3fd8 [TIPC] Initial merge |
74 75 76 |
msg_sect.iov_base = (void *)&sub->evt; msg_sect.iov_len = sizeof(struct tipc_event); |
db5a753bf Revert d88dca79d3... |
77 78 79 80 81 |
sub->evt.event = htohl(event, sub->swap); sub->evt.found_lower = htohl(found_lower, sub->swap); sub->evt.found_upper = htohl(found_upper, sub->swap); sub->evt.port.ref = htohl(port_ref, sub->swap); sub->evt.port.node = htohl(node, sub->swap); |
a62fbccec tipc: make subscr... |
82 83 |
tipc_conn_sendmsg(tn->topsrv, subscriber->conid, NULL, msg_sect.iov_base, msg_sect.iov_len); |
b97bf3fd8 [TIPC] Initial merge |
84 85 86 |
} /** |
57f1d1868 tipc: rename func... |
87 88 |
* tipc_subscrp_check_overlap - test for subscription overlap with the * given values |
b97bf3fd8 [TIPC] Initial merge |
89 90 91 |
* * Returns 1 if there is overlap, otherwise 0. */ |
a4273c73e tipc: remove stru... |
92 |
int tipc_subscrp_check_overlap(struct tipc_name_seq *seq, u32 found_lower, |
57f1d1868 tipc: rename func... |
93 |
u32 found_upper) |
b97bf3fd8 [TIPC] Initial merge |
94 |
{ |
a4273c73e tipc: remove stru... |
95 96 97 98 |
if (found_lower < seq->lower) found_lower = seq->lower; if (found_upper > seq->upper) found_upper = seq->upper; |
b97bf3fd8 [TIPC] Initial merge |
99 100 101 102 |
if (found_lower > found_upper) return 0; return 1; } |
a4273c73e tipc: remove stru... |
103 104 105 106 107 108 109 110 111 112 113 114 |
u32 tipc_subscrp_convert_seq_type(u32 type, int swap) { return htohl(type, swap); } void tipc_subscrp_convert_seq(struct tipc_name_seq *in, int swap, struct tipc_name_seq *out) { out->type = htohl(in->type, swap); out->lower = htohl(in->lower, swap); out->upper = htohl(in->upper, swap); } |
57f1d1868 tipc: rename func... |
115 116 117 |
void tipc_subscrp_report_overlap(struct tipc_subscription *sub, u32 found_lower, u32 found_upper, u32 event, u32 port_ref, u32 node, int must) |
b97bf3fd8 [TIPC] Initial merge |
118 |
{ |
a4273c73e tipc: remove stru... |
119 120 121 122 |
struct tipc_name_seq seq; tipc_subscrp_convert_seq(&sub->evt.s.seq, sub->swap, &seq); if (!tipc_subscrp_check_overlap(&seq, found_lower, found_upper)) |
b97bf3fd8 [TIPC] Initial merge |
123 |
return; |
308652314 tipc: remove filt... |
124 125 |
if (!must && !(htohl(sub->evt.s.filter, sub->swap) & TIPC_SUB_PORTS)) |
b97bf3fd8 [TIPC] Initial merge |
126 |
return; |
e15f88040 tipc: Add support... |
127 |
|
57f1d1868 tipc: rename func... |
128 129 |
tipc_subscrp_send_event(sub, found_lower, found_upper, event, port_ref, node); |
b97bf3fd8 [TIPC] Initial merge |
130 |
} |
57f1d1868 tipc: rename func... |
131 |
static void tipc_subscrp_timeout(unsigned long data) |
b97bf3fd8 [TIPC] Initial merge |
132 |
{ |
2f55c4378 tipc: remove unne... |
133 |
struct tipc_subscription *sub = (struct tipc_subscription *)data; |
13a2e8987 tipc: convert top... |
134 |
struct tipc_subscriber *subscriber = sub->subscriber; |
28353e7fa tipc: Consolidate... |
135 136 |
/* Notify subscriber of timeout */ |
57f1d1868 tipc: rename func... |
137 138 |
tipc_subscrp_send_event(sub, sub->evt.s.seq.lower, sub->evt.s.seq.upper, TIPC_SUBSCR_TIMEOUT, 0, 0); |
28353e7fa tipc: Consolidate... |
139 |
|
00bc00a93 tipc: involve ref... |
140 141 142 143 144 |
spin_lock_bh(&subscriber->lock); tipc_subscrp_delete(sub); spin_unlock_bh(&subscriber->lock); tipc_subscrb_put(subscriber); |
b97bf3fd8 [TIPC] Initial merge |
145 |
} |
00bc00a93 tipc: involve ref... |
146 |
static void tipc_subscrb_kref_release(struct kref *kref) |
eb409460b [TIPC]: Added sub... |
147 |
{ |
00bc00a93 tipc: involve ref... |
148 149 |
struct tipc_subscriber *subcriber = container_of(kref, struct tipc_subscriber, kref); |
a62fbccec tipc: make subscr... |
150 |
|
00bc00a93 tipc: involve ref... |
151 152 153 154 155 156 157 158 159 160 161 |
kfree(subcriber); } static void tipc_subscrb_put(struct tipc_subscriber *subscriber) { kref_put(&subscriber->kref, tipc_subscrb_kref_release); } static void tipc_subscrb_get(struct tipc_subscriber *subscriber) { kref_get(&subscriber->kref); |
eb409460b [TIPC]: Added sub... |
162 |
} |
1b764828a tipc: introduce t... |
163 164 165 166 167 168 169 170 171 172 |
static struct tipc_subscriber *tipc_subscrb_create(int conid) { struct tipc_subscriber *subscriber; subscriber = kzalloc(sizeof(*subscriber), GFP_ATOMIC); if (!subscriber) { pr_warn("Subscriber rejected, no memory "); return NULL; } |
00bc00a93 tipc: involve ref... |
173 |
kref_init(&subscriber->kref); |
1b764828a tipc: introduce t... |
174 175 176 177 178 179 |
INIT_LIST_HEAD(&subscriber->subscrp_list); subscriber->conid = conid; spin_lock_init(&subscriber->lock); return subscriber; } |
57f1d1868 tipc: rename func... |
180 |
static void tipc_subscrb_delete(struct tipc_subscriber *subscriber) |
13a2e8987 tipc: convert top... |
181 |
{ |
00bc00a93 tipc: involve ref... |
182 |
struct tipc_subscription *sub, *temp; |
ae245557f tipc: donot creat... |
183 |
u32 timeout; |
b97bf3fd8 [TIPC] Initial merge |
184 |
|
13a2e8987 tipc: convert top... |
185 |
spin_lock_bh(&subscriber->lock); |
b97bf3fd8 [TIPC] Initial merge |
186 |
/* Destroy any existing subscriptions for subscriber */ |
00bc00a93 tipc: involve ref... |
187 |
list_for_each_entry_safe(sub, temp, &subscriber->subscrp_list, |
57f1d1868 tipc: rename func... |
188 |
subscrp_list) { |
ae245557f tipc: donot creat... |
189 190 |
timeout = htohl(sub->evt.s.timeout, sub->swap); if ((timeout == TIPC_WAIT_FOREVER) || del_timer(&sub->timer)) { |
00bc00a93 tipc: involve ref... |
191 192 |
tipc_subscrp_delete(sub); tipc_subscrb_put(subscriber); |
b97bf3fd8 [TIPC] Initial merge |
193 |
} |
b97bf3fd8 [TIPC] Initial merge |
194 |
} |
13a2e8987 tipc: convert top... |
195 |
spin_unlock_bh(&subscriber->lock); |
28353e7fa tipc: Consolidate... |
196 |
|
00bc00a93 tipc: involve ref... |
197 198 199 200 201 202 203 204 205 206 207 |
tipc_subscrb_put(subscriber); } static void tipc_subscrp_delete(struct tipc_subscription *sub) { struct tipc_net *tn = net_generic(sub->net, tipc_net_id); tipc_nametbl_unsubscribe(sub); list_del(&sub->subscrp_list); kfree(sub); atomic_dec(&tn->subscription_count); |
b97bf3fd8 [TIPC] Initial merge |
208 |
} |
57f1d1868 tipc: rename func... |
209 210 |
static void tipc_subscrp_cancel(struct tipc_subscr *s, struct tipc_subscriber *subscriber) |
eb409460b [TIPC]: Added sub... |
211 |
{ |
00bc00a93 tipc: involve ref... |
212 |
struct tipc_subscription *sub, *temp; |
ae245557f tipc: donot creat... |
213 |
u32 timeout; |
eb409460b [TIPC]: Added sub... |
214 |
|
a13683f29 tipc: adjust lock... |
215 |
spin_lock_bh(&subscriber->lock); |
eb409460b [TIPC]: Added sub... |
216 |
/* Find first matching subscription, exit if not found */ |
00bc00a93 tipc: involve ref... |
217 |
list_for_each_entry_safe(sub, temp, &subscriber->subscrp_list, |
57f1d1868 tipc: rename func... |
218 |
subscrp_list) { |
db5a753bf Revert d88dca79d3... |
219 |
if (!memcmp(s, &sub->evt.s, sizeof(struct tipc_subscr))) { |
ae245557f tipc: donot creat... |
220 221 222 |
timeout = htohl(sub->evt.s.timeout, sub->swap); if ((timeout == TIPC_WAIT_FOREVER) || del_timer(&sub->timer)) { |
00bc00a93 tipc: involve ref... |
223 224 225 |
tipc_subscrp_delete(sub); tipc_subscrb_put(subscriber); } |
db5a753bf Revert d88dca79d3... |
226 227 |
break; } |
eb409460b [TIPC]: Added sub... |
228 |
} |
a13683f29 tipc: adjust lock... |
229 |
spin_unlock_bh(&subscriber->lock); |
eb409460b [TIPC]: Added sub... |
230 |
} |
7c13c6224 tipc: introduce t... |
231 232 |
static struct tipc_subscription *tipc_subscrp_create(struct net *net, struct tipc_subscr *s, |
c8beccc67 tipc: fix connect... |
233 |
int swap) |
a62fbccec tipc: make subscr... |
234 235 |
{ struct tipc_net *tn = net_generic(net, tipc_net_id); |
fead39098 tipc: rename stru... |
236 |
struct tipc_subscription *sub; |
c8beccc67 tipc: fix connect... |
237 |
u32 filter = htohl(s->filter, swap); |
eb409460b [TIPC]: Added sub... |
238 |
|
b97bf3fd8 [TIPC] Initial merge |
239 |
/* Refuse subscription if global limit exceeded */ |
a62fbccec tipc: make subscr... |
240 |
if (atomic_read(&tn->subscription_count) >= TIPC_MAX_SUBSCRIPTIONS) { |
2cf8aa19f tipc: use standar... |
241 242 |
pr_warn("Subscription rejected, limit reached (%u) ", |
34f256cc7 tipc: eliminate c... |
243 |
TIPC_MAX_SUBSCRIPTIONS); |
7c13c6224 tipc: introduce t... |
244 |
return NULL; |
b97bf3fd8 [TIPC] Initial merge |
245 246 247 |
} /* Allocate subscription object */ |
28353e7fa tipc: Consolidate... |
248 |
sub = kmalloc(sizeof(*sub), GFP_ATOMIC); |
a10bd924a [TIPC]: Enhanced ... |
249 |
if (!sub) { |
2cf8aa19f tipc: use standar... |
250 251 |
pr_warn("Subscription rejected, no memory "); |
7c13c6224 tipc: introduce t... |
252 |
return NULL; |
b97bf3fd8 [TIPC] Initial merge |
253 |
} |
b97bf3fd8 [TIPC] Initial merge |
254 |
/* Initialize subscription object */ |
4ac1c8d0e tipc: name tipc n... |
255 |
sub->net = net; |
308652314 tipc: remove filt... |
256 |
if (((filter & TIPC_SUB_PORTS) && (filter & TIPC_SUB_SERVICE)) || |
a4273c73e tipc: remove stru... |
257 |
(htohl(s->seq.lower, swap) > htohl(s->seq.upper, swap))) { |
2cf8aa19f tipc: use standar... |
258 259 |
pr_warn("Subscription rejected, illegal request "); |
b97bf3fd8 [TIPC] Initial merge |
260 |
kfree(sub); |
7c13c6224 tipc: introduce t... |
261 |
return NULL; |
b97bf3fd8 [TIPC] Initial merge |
262 |
} |
308652314 tipc: remove filt... |
263 |
|
db5a753bf Revert d88dca79d3... |
264 |
sub->swap = swap; |
57f1d1868 tipc: rename func... |
265 |
memcpy(&sub->evt.s, s, sizeof(*s)); |
a62fbccec tipc: make subscr... |
266 |
atomic_inc(&tn->subscription_count); |
7c13c6224 tipc: introduce t... |
267 268 269 270 |
return sub; } static void tipc_subscrp_subscribe(struct net *net, struct tipc_subscr *s, |
c8beccc67 tipc: fix connect... |
271 |
struct tipc_subscriber *subscriber, int swap) |
7c13c6224 tipc: introduce t... |
272 273 274 275 |
{ struct tipc_net *tn = net_generic(net, tipc_net_id); struct tipc_subscription *sub = NULL; u32 timeout; |
c8beccc67 tipc: fix connect... |
276 |
sub = tipc_subscrp_create(net, s, swap); |
7c13c6224 tipc: introduce t... |
277 278 279 280 281 |
if (!sub) return tipc_conn_terminate(tn->topsrv, subscriber->conid); spin_lock_bh(&subscriber->lock); list_add(&sub->subscrp_list, &subscriber->subscrp_list); |
f3ad288c5 tipc: protect tip... |
282 |
tipc_subscrb_get(subscriber); |
d4091899c tipc: hold subscr... |
283 284 |
sub->subscriber = subscriber; tipc_nametbl_subscribe(sub); |
7c13c6224 tipc: introduce t... |
285 |
spin_unlock_bh(&subscriber->lock); |
c8beccc67 tipc: fix connect... |
286 |
timeout = htohl(sub->evt.s.timeout, swap); |
ae245557f tipc: donot creat... |
287 288 289 290 |
if (timeout == TIPC_WAIT_FOREVER) return; setup_timer(&sub->timer, tipc_subscrp_timeout, (unsigned long)sub); |
f3ad288c5 tipc: protect tip... |
291 |
mod_timer(&sub->timer, jiffies + msecs_to_jiffies(timeout)); |
b97bf3fd8 [TIPC] Initial merge |
292 |
} |
13a2e8987 tipc: convert top... |
293 |
/* Handle one termination request for the subscriber */ |
57f1d1868 tipc: rename func... |
294 |
static void tipc_subscrb_shutdown_cb(int conid, void *usr_data) |
b97bf3fd8 [TIPC] Initial merge |
295 |
{ |
57f1d1868 tipc: rename func... |
296 |
tipc_subscrb_delete((struct tipc_subscriber *)usr_data); |
b97bf3fd8 [TIPC] Initial merge |
297 |
} |
13a2e8987 tipc: convert top... |
298 |
/* Handle one request to create a new subscription for the subscriber */ |
57f1d1868 tipc: rename func... |
299 300 301 |
static void tipc_subscrb_rcv_cb(struct net *net, int conid, struct sockaddr_tipc *addr, void *usr_data, void *buf, size_t len) |
b97bf3fd8 [TIPC] Initial merge |
302 |
{ |
c8beccc67 tipc: fix connect... |
303 304 305 306 307 |
struct tipc_subscriber *subscriber = usr_data; struct tipc_subscr *s = (struct tipc_subscr *)buf; int swap; /* Determine subscriber's endianness */ |
cb01c7c87 tipc: fix connect... |
308 309 |
swap = !(s->filter & (TIPC_SUB_PORTS | TIPC_SUB_SERVICE | TIPC_SUB_CANCEL)); |
c8beccc67 tipc: fix connect... |
310 311 312 313 314 315 316 317 |
/* Detect & process a subscription cancellation request */ if (s->filter & htohl(TIPC_SUB_CANCEL, swap)) { s->filter &= ~htohl(TIPC_SUB_CANCEL, swap); return tipc_subscrp_cancel(s, subscriber); } tipc_subscrp_subscribe(net, s, subscriber, swap); |
b97bf3fd8 [TIPC] Initial merge |
318 |
} |
13a2e8987 tipc: convert top... |
319 |
/* Handle one request to establish a new subscriber */ |
57f1d1868 tipc: rename func... |
320 |
static void *tipc_subscrb_connect_cb(int conid) |
b97bf3fd8 [TIPC] Initial merge |
321 |
{ |
1b764828a tipc: introduce t... |
322 |
return (void *)tipc_subscrb_create(conid); |
b97bf3fd8 [TIPC] Initial merge |
323 |
} |
57f1d1868 tipc: rename func... |
324 |
int tipc_topsrv_start(struct net *net) |
b97bf3fd8 [TIPC] Initial merge |
325 |
{ |
a62fbccec tipc: make subscr... |
326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 |
struct tipc_net *tn = net_generic(net, tipc_net_id); const char name[] = "topology_server"; struct tipc_server *topsrv; struct sockaddr_tipc *saddr; saddr = kzalloc(sizeof(*saddr), GFP_ATOMIC); if (!saddr) return -ENOMEM; saddr->family = AF_TIPC; saddr->addrtype = TIPC_ADDR_NAMESEQ; saddr->addr.nameseq.type = TIPC_TOP_SRV; saddr->addr.nameseq.lower = TIPC_TOP_SRV; saddr->addr.nameseq.upper = TIPC_TOP_SRV; saddr->scope = TIPC_NODE_SCOPE; topsrv = kzalloc(sizeof(*topsrv), GFP_ATOMIC); if (!topsrv) { kfree(saddr); return -ENOMEM; } topsrv->net = net; topsrv->saddr = saddr; topsrv->imp = TIPC_CRITICAL_IMPORTANCE; topsrv->type = SOCK_SEQPACKET; topsrv->max_rcvbuf_size = sizeof(struct tipc_subscr); |
57f1d1868 tipc: rename func... |
351 352 353 |
topsrv->tipc_conn_recvmsg = tipc_subscrb_rcv_cb; topsrv->tipc_conn_new = tipc_subscrb_connect_cb; topsrv->tipc_conn_shutdown = tipc_subscrb_shutdown_cb; |
a62fbccec tipc: make subscr... |
354 355 356 357 358 359 |
strncpy(topsrv->name, name, strlen(name) + 1); tn->topsrv = topsrv; atomic_set(&tn->subscription_count, 0); return tipc_server_start(topsrv); |
b97bf3fd8 [TIPC] Initial merge |
360 |
} |
57f1d1868 tipc: rename func... |
361 |
void tipc_topsrv_stop(struct net *net) |
b97bf3fd8 [TIPC] Initial merge |
362 |
{ |
a62fbccec tipc: make subscr... |
363 364 365 366 367 368 |
struct tipc_net *tn = net_generic(net, tipc_net_id); struct tipc_server *topsrv = tn->topsrv; tipc_server_stop(topsrv); kfree(topsrv->saddr); kfree(topsrv); |
b97bf3fd8 [TIPC] Initial merge |
369 |
} |